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Force.com Cookbook Sample Code
Chapter 4: Best Practices for Writing Apex - Controlling Recursive Triggers

To download all the code samples, access the Cookbook. -

This Apex trigger is part of an example that shows how to control trigger recursion by using static member variables.

For this example to work properly, you first must define a custom checkbox field on Task. In this example, this field is named Create_Follow_Up_Task__c.

public class FollowUpTaskTester {

	private static integer NUMBER_TO_CREATE = 4;
	private static String UNIQUE_SUBJECT = 'Testing follow-up tasks';

	static testMethod void testCreateFollowUpTasks() {
		List<Task> tasksToCreate = new List<Task>();
		for (Integer i = 0; i < NUMBER_TO_CREATE; i++) {
			Task newTask = new Task(subject = UNIQUE_SUBJECT, ActivityDate = System.today(), Create_Follow_Up_Task__c = true );
			System.assert(newTask.Create_Follow_Up_Task__c);
			tasksToCreate.add(newTask);
		}

		insert tasksToCreate;
		System.assertEquals(NUMBER_TO_CREATE,[select count() from Task where subject = :UNIQUE_SUBJECT and ActivityDate = :System.today()]);

		// Make sure there are follow-up tasks created
		System.assertEquals(NUMBER_TO_CREATE, [select count() from Task where subject = :FollowUpTaskHelper.getFollowUpSubject(UNIQUE_SUBJECT) and ActivityDate = :System.today()+1]);
	}

	static testMethod void assertNormalTasksArentFollowedUp() {
		List<Task> tasksToCreate = new List<Task>();
		for (integer i = 0; i < NUMBER_TO_CREATE; i++) {
			Task newTask = new Task(subject=UNIQUE_SUBJECT, ActivityDate = System.today(), Create_Follow_Up_Task__c = false);
			tasksToCreate.add(newTask);
		}

		insert tasksToCreate;
		System.assertEquals(NUMBER_TO_CREATE, [select count() from Task where subject=:UNIQUE_SUBJECT and ActivityDate =:System.today()]);

		// There should be no follow-up tasks created
		System.assertEquals(0, [select count() from Task where subject=:FollowUpTaskHelper.getFollowUpSubject(UNIQUE_SUBJECT) and ActivityDate =:(System.today() +1)]);
	}
}

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